How many Little Black Dresses should a girl have in her closet?

I have a long sleeve little black dress, a three quarter sleeve little black dress, and a short sleeve little black dress. I do not have a sleeveless little black dress. I actually own three right now. I have heard it said that everybody needs at least one. You cannot go wrong. It is a staple. How many should a girl have in your opinion?

How many Little Black Dresses should a girl have in her closet?
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